Ours did not work with our 25 year old boiler ecen with a connector. We
were quoted $600 to have a c wire installed. Our 4 theremostats work
fine on the app with any connector. We were able to nstall them
ourselves.
This has been a nightmare for us. Long time, early adaptor - Nest users
in our 29 year old residence (2 nests) and 38 year old vacation home (2
nests). We had a flood in our second home due a malfuntioning heating
system and freezing pipes so wanted ...
I am finding that ecobee and Honeywell have discontinued support for
their thermostats in the past. The only reason I elected to get a
"smart" thermostat was the ability to control remotely. It appears that
the best option is to find the cheapest mod...